"Michael L. Hostbaek" <mich at FreeBSD.org> writes:
> traore at afribone.net.gn (traore) writes:
> from 'man ipfw' :
> { MAC | mac } dst-mac src-mac
But note that this is only available in ipfw2, which is not the
default in FreeBSD 4.x. The same manual page describes how to compile
it into your kernel.